In the north, Gladenbach borders on the community of Dautphetal, in the northeast on the town of Marburg, in the east on the community of Weimar, in the southeast on the community of Lohra (all in Marburg-Biedenkopf), in the southwest on the community of Bischoffen (Lahn-Dill-Kreis), and in the west on the community of Bad Endbach (Marburg-Biedenkopf).
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The highway runs thence alongside the Aartalsee (a reservoir) on to Herborn, ending at Montabaur.
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An important east-west traffic thoroughfare in Gladenbach is the Federal Highway (Bundesstraße) 255 crossing the municipal area from Marburg through the constituent communities of Weimar and Lohra, leaving the municipal area at Weidenhausen in the area of the Zollbuche ("Customs Beech" – it once marked the border between Hesse-Darmstadt and Hesse-Nassau) southwestwards towards the community of Bischoffen in Lahn-Dill district.
The school has taken part in an international forum in Europe, with students travelling to Gladenbach, Germany to take part in international conferences.
Among its neighbouring communities are Weimar an der Lahn in the northeast, Fronhausen in the southeast and in the northwest Gladenbach, all in the Marburg-Biedenkopf district, as well as the town of Lollar, Wettenberg and Biebertal in Gießen district, and Bischoffen in Lahn-Dill district.